Method for treating roasted ores with liquids.



- I v v Amman. METHOD FOR TREATING ROASTED ORES WITH LIQUIDS.

APPLICATION FILED MAR 4, I915- Patented Aug. 7, 1917.

METHOD roe Tamarind nonsrnp onus warn mourns.

' Application filed March 4, 1915. I Serial N 0. 12,010.

To all whom it may concemg:

Be it known that I, ARTHUR RAMiiN, a subject of the King of Sweden,residing at Villa Skansen, Olympia, Halsingborg,

Sweden, have invented new and useful Improvernentsin Methods forTreating; Roasted Ores with Liquids, of which the following is aspecification. I

The present invention relates to a method of treating roasted ores forthe purpose of facilitating their subsequent lixiviation If for instancea chloridizing roasted ore is lixiviated. in the hitherto used manner invats or basins, it will harden or form larger or smaller agglomerates orlumps, whereby the lixiviation is highly retarded I and large quantitiesof lixiviating liquid'are needed. The formation of such lumps oragglomerates is due to the fact, that all the.

particles ofthe ore have not been treated with equal quantities ofliquid, some particles absorbing the liquid more rapidly, than the otherones. These particles also become lixiviated easier than the other onesat a subsequent li-Xiviation, because the liquid can pass betterthroughthem than throu'ghthe other-jones, so that it will be formed inthe whole bulk' of the ore channels or passages, through which thelixiviat in liquid preferably passes, while other portions of the orebecome actedupon by the said liquid in a relatively little degree.

For that reason the lixiviating liquid must,

be used ina very great excess, and the time of lixiviation must be verylong if a complete lixiviation of the roasted ore shall take place.

If ores, having been subjected to a chloridizing roasting, are treatedinthe mannerhereinafter [described and forming the obtlty of liquid(which quantity shall only be such that the ore becomes intimately-mixedtherewith Without any great excess of the liquid in the mixture) and ifthe'said treat ment is carried out before the ore is brought to the vatsor basins, in which the usual lixiviation takes place, the idvantag'e isgained, that the ore during this lixiviation does not form' agglomeratesor lumps, (counteracting a complete and rapid lixivi ation), because allthe particles of ore al ready from the beginning of the treatment aretreated with even that quantity of liquid, which they are able toabsorb, whereby the said particles have changed their Specification 01Letters Batent.

pact of the invention, with a suitable qllfll'lr.

Patented Augn' l, 1%17.

physical qualities and lost their disposition of absorbing diii'erentquantities of liquid and of forming hard'lnmpsor agglomerates.

For this reason, any f( rmation of lumps and agglonierates is avoided,and the whole mass will be completely porous and penetrable for liquidwhich is not otherwise the case. At a following lixiviation invats orbasins of ore thus treated the process can be effected in a fraction ofthe time which is otherwise necessary, because no hard a; glonierateshave been formede which require longer time for lixiviation; thesolutions obtained also will be concentrated. 1

The liquid used for treating the ore cools it, if the ore is hot, forwln'hh reason the ore at the lixivia'tion in the vats or basins is cooland cannot cause any formation of dust and steam, which formation nowtakes place at the treatment with the liquid now mentioned, whereby thecollection of dust,

not permeable to liquid, is sprinkled or.v

sprayed as it isfed forward, by a quantity of liquid distributed overthewidth thereof, while at the same time the dust and vapors which may beformed when the hot ore is sprinkled with the liquid can be carried awayby suction ton condenser in which the gases are condensed by means ofliquid while the ore particles are suspended in the condensed productfrom which they are afterward filtered off. i

In the accompanying drawing, a device suitable for carrying out this.method is shown in a side view in Figure 1 and in a plan view in Fig.2.

,The apparatus illustrated in Figs. 1 and 2 consists of a feeding"hopper a for the roasted material, the lower mouth of said of thehopper, as regards the direction of rotation of the table, is a pipewith several small openings, through which water or other liquid may besprinkled over the hot materiah'fed forward in an even layer over thetable, said material'being then evenly treated with the liquid so asto'be cooled and transformed in a more easily extractable ranged aroundthe apparatus (shown in dash and dotted lines) and serving to preventthe formed vapors and dust from spreading; said casing should beprovided with a pipe 6 leading to a condenser f on the v tion of theoremay first be extracted in one bottom of which the ore particles arecollected. The hot water (or liquid) obtained by condensation of liquidin the condenser is conducted ofi alone at g and used for in- I stancefor lixiviating ore in extracting whereby the heat taken from the ore isutilized. The non-condensed gases are conducted oil at it. The ore onthe table is carried, during the rotation of said table, to

. ward a scraper i which removes it from the,

table through an opening in the casing.

If the ore is not subjected to. the liquid in a hot condition no vaporsare termed and the casing can be omitted.

The sprinkling with liquids of substances placed upon a movable filterbed for lixiviation, extraction or washing of them is known. Accordingto the present invention a movable bed 15; used not for lixiviation, butfor the mixing of the roasted ore with a liquid, so that all theparticles of the orebecome uniformly treated and are uniformly alteredas to their physical or chem ical qualities, whereby better results areobtained at the subsequent lixiviation.

By exactly suiting the quantity or the na-, ture of the liquid used insuch treatment of roasted ore some of the salts present in the roastedore can be transformed into a more readily soluble state than otherones. By Successive lixiviation of the ore thus treated there may thusfirst be obtained a solution which chiefly contains the moresolublesaltsand then a solution containing the less soluble ones It ispossible in the manner now described to treat efficiently orescontaining substances which have been transformed, by chloridiziug orother roasting, into a form soluble in certain solvents or originallyare present in the ore in this form. Thus for'instance ore containingsilver which has been transformed into silver chlorid by chloridizingroasting can be treated with a solution of common salt or hyposulfite,or, if containing gold, with chlorinous water, it being then possible totreat all theparticles with equal quantities of solvent which thus neednot be added in excess. In a similar way other solvents may be employedor such liquids which are obtained at the extraction of ores treatedaccording to the present method.

In the manner now described it is easier than before to utllize forinstance zlnc from the solutions or lyes obtained in extracting roastedcopper ore containing zinc. As the copper, for economical reasons, isgenerally precipitated from. the lyes by means of iron which then ispartially dissolved, the final capable of being used.

roasting in theabove described manner the zinc during the followingcomplete lixivialye and the copper in a following one. In the first lyethen a quantity of copper will be present, but so small that only a verysmall quantity of iron will be required for precipitating it. For thisreason. very small quantities of iron are dissolved in the zinc solutioncompared with the quantities obtained in the usual processes, and thesequantities therefore can easily be removed, compared with the largequantities of iron present in the solutions after precipitating thecopper by iron from solutions containing zinc according to the usualprocess.

It is obvious that similar advantages are obtained in utilizing "zincsolutions even if another nrccipitating agent for copperthan iron isused.

For controlling the quantities of liquid and ore the speed of thecarrier may be made a dj ustable.

Having now particularly described the nature of my invention and themanner of its operation, what I claim is:

1. The method of treating roasted ores which consists in continuouslyfeeding the ore in a thin layer upon a movable impermeable bed,sprinkling the layer uniformly with a quantity of liquid, removing theore and absorbed liquid from the bed, and liXiV- iating the same.

2; The method of treating roasted ores which consists in continuouslyfeeding the orc in a thin layer upon a movable impermeable bed,sprinkling the layer uniformly with a quantity of liquid, removing bysucing the sprinkling, removing the ore and absorbed liquid from thebed, and lixiviating the same.

The method of treating roasted ores which consists in continuouslyfeeding the ore in a thin layer upon a movable impermeable bed,sprinkling the ore uniformly with a quantity of 'a liquid adapted torender some constituents of the ore more soluble than others, removingthe ore and absorbed liquid from the bed, and lixiviating the same.

at. The method of treating roasted ores which consists in continuouslyfeeding the ore in a thin layer upon a movable impermeable bed,sprinkling the ore uniformly with a quantity of a. liquid adapted torender some constituents of the ore more soluble than others, removingby suction. the gases, vapors and dust formed during "the sprinkling,removing the ore and absorbed-liquid from the bed, and lixiviating thesame.

memes! 5. The method of treating roasted. ores which consists in feedingthe ore in a thin layer upon a movable impermeable bed, sprinkling theore uniformly with a quantity of liquid, removing by suction the gases,vapors and dust formed during the sprinkling, removing the ore andabsorbed liquid from the beci, and subjecting it to repeatedlixiviations for obtaining difi'erent lyes.

6. The method of treating roast/ed ores which consists in feeding theore in a thin layer upon a movable impermeable bed, sprinkling ituniformly with a quantity of a liquid adapted to render someconstituents of the ore more soluble than others, remov ing by suctionthe gases vapors anddnst formed during the sprinkiing, removing the oreand absorbed liquid from the bed, and

v ARTHUR RANK,

VVitnesses ADA SIMON, H. HAMMAL.

